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氟化镧单晶膜电极是性能优越的离子选择电极,它对氟离子具有较理想的选择性。氨电极成功地解决了氟的快速分析这一难题。本文用苏州计量局实验工厂生产的氟电极,选择不同的离子强度调节液和测定方法,对海盐中氟的含量进行测定。实验结果表明,在相同条件下,格氏(Gran)作图法效果较好。测定平均值为0.90mg/kg;标准偏差为0.056;变异系数6.6％;平均回收率在99.6％左右。实验一、仪器与主要试剂一.仪器:PHS—3型酸度计,电动磁力搅拌器(上海第二分析仪器厂):PXJ—
Lanthanum fluoride single crystal membrane electrode is a superior performance of the ion-selective electrode, which fluoride ion has an ideal selectivity. Ammonia electrode successfully solved the problem of rapid analysis of fluorine. In this paper, the fluorine electrode produced by the experimental plant of Suzhou Bureau of Metrology was used to determine the content of fluorine in sea salt by selecting different ionic strength adjusting solution and measuring method. The experimental results show that under the same conditions, the effect of Gran mapping is better. The average measured value was 0.90mg / kg; the standard deviation was 0.056; the coefficient of variation was 6.6%; the average recovery was about 99.6%. First, the instrument and the main reagent I. Instrument: PHS-3 pH meter, electric magnetic stirrer (Shanghai Second Analytical Instrument Factory): PXJ-